Drilling-machine



(No Model.) 1

B. B.r HARTLEY.

` DRILPING MACHINE.

Pajsented Mar. 14, 1882.

WWI 1555155- mon breast-drill.

UNITED STATES PATENT OFFICE.

D. BERT HAR'ILEY, OF CHICAGO, ASSIGNOR OF ONE-HALF TO FRANK F. BEATS, OF ROCKFOBD, ILLINOIS.

DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 255,079, dated March 14, 1882,

' Application led September 19,1881. (No model.)

To all whom it may concern:

Be it known that I, D. BERT HARTLEY, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drilling-Machines; and I do hereby declare the following to be a full, clear, and exact description thereof, that will enable others to understand and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, forming a part of this specification.

The object of this invention is to provide a simple and convenient device whereby an ordinary breast-drill may be temporarily converted into a vertical machine or power drill as occasion may require.

Figure l is a side elevation embodying my improvement; Fig. 2, an elevation of a com- Fig. 3 is a side view of a bracket adapted to support the drill, and Fig. 4 is a-vertical transverse section in the` line 4 4, Fig. 3.

Referring to the drawings, A represents an ordinary breast-drill, consisting of the drillstem B, the breast-plate B', the bevel-gear wheels B2 B3, the operating-crank B4, and the hand-grasp C.

The bracket C is provided with the attaching-flange a, the opposite end being formed with the round part C2, which is perforated, as indicated by the dotted lines, for the insertion ofthe drill-stock. The under side ofthis bracket is recessed for the reception of the rotating sheaves a a2, adapted to carry the cord. C3, which passes ovtr the sheave a and under the sheave a2. The removable boltC4 passes down through the bracket and through a hole in the hand-grasp C. The bracket shown in Fig. 3 ofthe drawings has the arm Dformed integral, which serves to strengthen the bracket and holds the drill firmer in heavy work; but ordinarily the bracket shown in Fig. l of the drawings, will answer thepurpose. The bracket C may be attached to the wall or other convenient place by means of the screws or bolts a?, inserted through the flange c, andthe foottreadle D placed in a position corresponding thereto.

The spiral spring D2 is placed upon the upper end of the drill-stock B, as shown in Fig.

- `l ofthe drawings, the lower end bearing on the flange a4 and the upper end against the under side of the breast-plate B', and serves to return the drill to a normal position when the pressure is relaxed on the treadle. 5:

When it is desired to change the breast-drill into a machine-drill it is easily and quickly accom plished byremovin g the detachablebreastplate and passing the drill-stock up through the outer end of the bracket, placing the spiral spring in position, and replacing the breastplate 5 then insert the bolt C4 through the hole in the hand-grasp and throw the upper end of the double cord G3 over the breast-plate, the lower end being attached to the hook d in the treadle-lever D. The drill is now ready for use, the feed being regulated by the pressureof the foot of the operator on the treadle, when the process of drilling may be. rapidly and easily performed.

By extending outward the bearing-shaft of the vertical gear-wheel a place may be provided for a band or driving pulley and the device operated by power other than handpower.

It is obvious that various forms of hrackets or devices may be ,used for supporting the breast-drill when changed into a machine or hand drill, and also by a very slight change the drilling apparatus may be arranged in a horizontal position as well as a vertical one. I therefore do not strictly confine myself to the arrangement herein shown, but may use any equivalent devices.

The breast-plate B is secured to the drillstock by means of a pin so arranged as to readily permit of the removal of the breastplate when required, and at the same time prevent the spiral spring from forcing the same out of position.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

l. In a breast-drill adapted to be temporarily converted into a machine-drill, the combination, with the supporting bracket C', ofthe spring D2, the drillstem or stock B, the breastplate B, the cord C3, and the treadle-board D', y substantially as described.

2. The combination, with the hand-grasp C, of the locking-bolt C* and the supportingbracket C', substantially as described.

D, BERT HABTLEY.

ICO

Witnesses:

FRANK F. PEATs, L. B. COUPLAND. 

